Refrigerator evaporator



2 Sheets-Sheet 1 Filed Sept. 23, 1935 INVENT OR.

Rani/0 hMoNEK ATTORNEYS.

Oct. 12, 1937.

R.- H. MONEY REFRIGERATOR EVAPORATOR Fil ed Sept. 25; 1935 2 Sheets-Sheet 2 INVENT R.

ATTORNEYa$-,

- BY M dea UNITED STATES PATEKNVT' OFFICE I REFRIGERATOR EVAPOBATOR Roland H. Money, Cincinnati, Ohio, assignor to The Crosiey Radio Corporation, Cincinnati, Ohio, a corporation of Ohio.

Y Application September23, 1935, Serial No. 41,643

' 8 Claims. (Ci. sa -12c) My invention relates to evaporators for retaken through the last figure showing the interfrigerators in which provision is made for one or nal arrangement. v more ice forming trays. It is applied more par- The outer sheet of the evaporator structure ticularly to the type of evaporator in which the shown, is indicated at I, and extends from they refrigerant conducting passages in the evaporatwo lower edges of the structure, up the sides tor are formed by corrugations or ribs in the and across the top thereof, being bent to form outer sheet or sheets of the structure, as distinpart of a header as "at 2. This sheet is formed guishedfrom the passages being formed of tubes with ribs therein for refrigerant conductors as or a coil of tubes. will be described. I 1 I m In the type of evaporator with which I am con- Welded to this outer sheet at the edges and cerned, formed of sheet metal with the passages preferably at points intermediate the ribs of running in parallel lines along the sides'thereof, the outer sheet is an inner structure. The upper it has been considered impractical to supply reportion thereof is formed of a sheet 3 which is frigerantto the shelf or shelves within the evapformed into a Closed Shape, t0 fit Within t orator structure on whichthe ice trays are supupper portion of the formed outer sheet, with a 15 5 evaporator.

ported, except by introducing it directly to the depression at the top as at 4 to complete the shelf before conducting it to the rest of the evapheader of the structure. This sheet 3, forms the orator. The reason for this is that the mere proshelf 5 on which, in the example shown, two ice vision of ducts leading into the shelf, from the trays can be mounted.

main ducts of the evaporator, as by forming the A S eet 6. i also or ed clOSed Shape shelf oftwo pieces secured at the edges with one to fit the lower portion of the outer bent sheet of them corrugated to form the passages or ducts, and the shelf 5. This sheet has ribs at the p will not suffice. In such a case there will be no to f t fri rant passa wa s r the t e flow of refrigerant in the ducts, and indeed oil shelf as will be d s rib nd at it edges i 2 It is my object to provide for a refrigerated side sheet.

ice tray shelf across the interior of the evapora- The sheet 6 when installed does not come to the tor. In this connection I provide for positive bottom of the e. i he's des d assurance of flow of refrigerant and by the con-" y d The vbottom 0f the evaporate! is formed will collect therein, which excludes refrigerant. w d d to t e S d y shelf as Well as to e '25 struction avoid any pockets for oilto collect and f a S eet W c iS formed W ridges, as w 30 block the refrigeration of the shelf. be described, matching and/communicating with That such a shelf is highly useful in quickly the ridges of the outer sheet- This bottom l forming ice in an ice tray or freezing other maas. a eu ded 'd p s e at at ll'illnde terials as desired, is obvious. ed projection 9 in the bottom of the sheet 6,

' -I have illustrated in th appended dr thereby forming the bottom header ofthe device. 35 preferred form of evaporator structure embody- The bottom sheet is flanged t Which flange 5 ing my invention, selecting for purposes of lllusthe portion that is welded to the side sheet at tration the type of evaporator which is built s owe e d as well a the s ort projecting d salong the same lines as that describedin my tanee Of f edgesi 1 United, States Letters Patent No. 1,975,659,dated The side sheet and bottom sheets are those 40 October 2, 1934. In the claims which are added own in Patent above referred to- The to this specification, I will set forth the novelty nor f p t in h devi e to eth r is l l inherent in the structure described, irrespective ed in y Sa d Letters Patent h the l 'Of those individual features thereof with which tion that the interior of the structure is formed my present invention is not concerned but which of two closed sheet bodies instead of one, this 4 5 are shown and described in order to specify a letter structur hav ng be adopted to p v complete and fully operative structure. "for the refrigerated shelf.

In the drawings: Referrlngnow to the ridges which form the re- Fig. 1 is-a front elevatio of my, improved frlgerant ducts of the--evaporator, the ridges V V II and I2 in the outer sheet communicate with Fig. 2 is a side elevation of Fig. 1. the central rounded portion 2 that forms the Fig. 3 is a section along the line 3-3 of Fig. 2. header. Every other. one of these ridges i. e.

Fig. 4 is 'a. side elevation of a modified form of the ridges ll, terminates where the refrigerated evaporator. shelf is located. The intervening ridgesv con- Fig. 5 is an end elevation partly in seetioii, time 'down to the lower end at each side of the outer shell, but in a double size or thereabouts, so as to form larger ducts or ridges l3, than the upper portions thereof, indicated at II.

The ridges I in the base sheet communicate with the ridges l3, and in number are the same as the ridges [3; as well as in size.

The upper portion of the lower section 6 of the evaporator which underlies the shelf 5, is formed with ridges therein which are in the form of loops l5. These loops are arranged so that one leg of each loop comes opposite the upper end of a ridge I3, and the other leg comes opposite the terminus of a ridge 1 I As so constructed refrigerant flows out from the bottom header through the ducts formed by the ridges in the base and rises through the ducts formed by the ridges l3. A larger quantity can flow in these ducts than would flow if they were smaller in dimensions. Where the shelf ducts or loops l communicate with the upper ends of the duct portions l3, some of the refrigerant which cannot pass up to the upper header through the narrow duct portions l2, will pass around through the loops and from the ends of the loops will flow through the ducts II to the upper header.

It will be noted that flow is required through the shelf ducts by the structure. described, and that there will be no pockets in which oil can collect and block the action of the evaporator. At the same time there is no part .of the evaporator which is not refrigerated at the sides.

Merely larger ducts take the place of some of the ducts which normally would extend down the sides.

- I have shown a shelf 16 across the lower half of the evaporator interior, but this is not necessary. I have shown tray stops I! in the several shelves including the refrigerated shelf. These are humps pressed up in the sheets forming the shelves or shelf tops as the case may be.

It will be apparent that the structure, now described with modifications necessary and obvious to accommodate other structures of the type of evaporator now described, could be readily applied to any of such evaporators. The number of sheet parts of which the evaporator is built could, for example, be increased. The shape of the entire structure could be changed, and the number and size of shelf ducts and arrangements therefor cut down. The device could be one tray wide or two orthree trays wide. With an increase in number of ducts more shelves could .be refriger- 4 ated. In such an arrangement staggered ducts in the main walls could readily be arranged to bring the shelf loops in series with the main flow.

The modification shown in Figs. 4 and 5, shows a structure according to my invention, whereby a series of shelves are provided for. The outer shell of the evaporator is formed with ducts 30, asa lower set connecting with the bottom header and ducts, ducts 3|, offset from the ducts 30, 'and ducts 32 offset from the ducts 3| and con necting to the top ,header. The shelves in this modification are like those in the other form.

The loop ducts 33 in the lower shelf connect ducts through the shelves, accomplishedby an interruption of ducts.

By stating the above possible modifications, I do not wish to. exclude others, nor to minimize the advantages of the particular arrangement shown, which I consider to be advantageous because of its simplicity and inexpensiveness.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:-

1. In an evaporator of the sheet type ribbed to form ducts, a shelf formed transverse the structure, a ribbed sheet secured to said shelf to form refrigerantpassages between them, said passages formed as loops, and the ribs constituting the ducts in the outer sheet of the structure being'formed to cause refrigerant flowing up through them to pass through and out of said loops. g

2. An evaporator comprising a lower header, and upper header, a sheet metal case formed of ribbed outer walls to form ducts from the lower header to the upper header, a shelf intermediate of and across the said sheet metal case for an ice tray or the like, said shelf being formed of two pieces ofxsheet metal ribbed to form ducts in the form of loops, and so mounted as to cause these ducts to communicate with the ducts in the case, the said ducts in the 'case being formed to enforce flow of refrigerant through the said loops. I

3. An evaporator comprising a lower header, and upper header, a sheet metal case formed of ribbed outer walls to form ducts from the lower header to the upper header, a shelf intermediate of and across the said sheet metal case for an -ice .tray or the like, said shelf being formed of two pieces of sheet metal ribbed to form ducts in the form of loops, and so mounted as to cause these ductsto communicate with the ducts in the case, the ducts in the case being arranged so that one end of each loop communicates with a duct extending only from the loop to the upper header, and so that the other end of each loop communicates with a duct in the case which extends from the lower header to the upper header.

4. An evaporator comprising a lower header, and upper header, a sheet metal case formed of ribbed outer walls to form ducts from the lower header to the upper header, a shelf intermediate of and across the said sheet metal case for an ice tray or the like, said shelf being formed of two pieces of sheet metal ribbed to form ducts that one end of each loop communicates with a duct extending only from the loop to the upper header, and so that the other end of each loop communicates with a duct in the case which extends from the lower header to the upper header, said latter duct being of greater capacity from the lower header to said point of communication, than from the point of communication to the upper header.

5. -An evaporator comprising an outer sheet metal piece ribbed to form ducts extending up the sides thereof, an inner sheet metal piece arranged to nest within and be welded to the outer piece, thereby forming part of an evaporator, a sheet metal piece to nest within the outer sheet below the piece last above'noted, forming the remainder of the-inner sides of the evaporator, said latter piece ribbed to form ducts extending between ends of the outer piece to formv the bottom 0 the evaporator.

6. An evaporator comprising an; outer sheet metal piece ribbedt'o form ducts extending up the sides thereof, an inner sheet metal piece arranged to nest within and be welded to the outer with ducts formed in the outer sheet, and means located below the latter piece and secured, to

the ends of the outer piece to form the bottom of the evaporator, the ducts in said latter piece 1 being in the form oi. loops communicating with alternate ducts in the outer casing '7. An evaporator comprising an outer sheet metal piece ribbed to form ducts extending up the sides thereof, an inner sheet metal piece arranged to nest within and be welded to the outer piece, thereby forming part of an evaporator, a sheet metal piece to nest within the outer sheet below the piece last above noted, forming the remainder of the inner sides of the evaporator, said latter piece ribbed to form ducts extending between its upper part and the lower part of the ..flrst mentioned inner piece, which ducts communicate with'ducts formed in the outer sheet,-

and means located beiowthe latter piece and secured to the ends of the outer piece to form the bottom of the evaporator, the ducts in said lat-- ter' piece being in the form of loops communi-' eating with alternate ducts in the-outer casing,-

said ducts in the outer casing being of greater capacitybelow than above the entrance 'to-th'e said loops, and from the exit of said loops exv tending only upwardly therefrom.

8. A sheet metal evaporaitor having ducts, wherein said ducts are formed by the .corrugating of metal walls secured together at their edges,

said evaporator having ducts formed in the side,

walls thereof, shelves across the interior of the evaporator, and loop ducts in-the shelvesextending from aipoint of communication with a duct in one of the sidewalls, to a pointof communica- "tion with another duct in the same side' wall, said latter duct terminating at said point of communication, whereby refrigerant is caused to flow through said shelf ducts..

RoLAND- 1r. MONE 

